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19#include "xfs.h"
20#include "xfs_fs.h"
21#include "xfs_format.h"
22#include "xfs_log_format.h"
23#include "xfs_trans_resv.h"
24#include "xfs_sb.h"
25#include "xfs_ag.h"
26#include "xfs_mount.h"
27#include "xfs_da_format.h"
28#include "xfs_da_btree.h"
29#include "xfs_inode.h"
30#include "xfs_dir2.h"
31#include "xfs_dir2_priv.h"
32#include "xfs_error.h"
33#include "xfs_trans.h"
34#include "xfs_buf_item.h"
35#include "xfs_cksum.h"
36
37
38
39
40
41
42int
43__xfs_dir3_data_check(
44 struct xfs_inode *dp,
45 struct xfs_buf *bp)
46{
47 xfs_dir2_dataptr_t addr;
48 xfs_dir2_data_free_t *bf;
49 xfs_dir2_block_tail_t *btp=NULL;
50 int count;
51 xfs_dir2_data_hdr_t *hdr;
52 xfs_dir2_data_entry_t *dep;
53 xfs_dir2_data_free_t *dfp;
54 xfs_dir2_data_unused_t *dup;
55 char *endp;
56 int freeseen;
57 xfs_dahash_t hash;
58 int i;
59 int lastfree;
60 xfs_dir2_leaf_entry_t *lep=NULL;
61 xfs_mount_t *mp;
62 char *p;
63 int stale;
64 struct xfs_name name;
65 const struct xfs_dir_ops *ops;
66
67 mp = bp->b_target->bt_mount;
68
69
70
71
72
73 ops = xfs_dir_get_ops(mp, dp);
74
75 hdr = bp->b_addr;
76 p = (char *)ops->data_entry_p(hdr);
77
78 switch (hdr->magic) {
79 case cpu_to_be32(XFS_DIR3_BLOCK_MAGIC):
80 case cpu_to_be32(XFS_DIR2_BLOCK_MAGIC):
81 btp = xfs_dir2_block_tail_p(mp, hdr);
82 lep = xfs_dir2_block_leaf_p(btp);
83 endp = (char *)lep;
84
85
86
87
88
89
90
91
92 XFS_WANT_CORRUPTED_RETURN(be32_to_cpu(btp->count) <
93 ((char *)btp - p) / sizeof(struct xfs_dir2_leaf_entry));
94 break;
95 case cpu_to_be32(XFS_DIR3_DATA_MAGIC):
96 case cpu_to_be32(XFS_DIR2_DATA_MAGIC):
97 endp = (char *)hdr + mp->m_dirblksize;
98 break;
99 default:
100 XFS_ERROR_REPORT("Bad Magic", XFS_ERRLEVEL_LOW, mp);
101 return EFSCORRUPTED;
102 }
103
104
105
106
107 bf = ops->data_bestfree_p(hdr);
108 count = lastfree = freeseen = 0;
109 if (!bf[0].length) {
110 XFS_WANT_CORRUPTED_RETURN(!bf[0].offset);
111 freeseen |= 1 << 0;
112 }
113 if (!bf[1].length) {
114 XFS_WANT_CORRUPTED_RETURN(!bf[1].offset);
115 freeseen |= 1 << 1;
116 }
117 if (!bf[2].length) {
118 XFS_WANT_CORRUPTED_RETURN(!bf[2].offset);
119 freeseen |= 1 << 2;
120 }
121
122 XFS_WANT_CORRUPTED_RETURN(be16_to_cpu(bf[0].length) >=
123 be16_to_cpu(bf[1].length));
124 XFS_WANT_CORRUPTED_RETURN(be16_to_cpu(bf[1].length) >=
125 be16_to_cpu(bf[2].length));
126
127
128
129 while (p < endp) {
130 dup = (xfs_dir2_data_unused_t *)p;
131
132
133
134
135
136 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
137 XFS_WANT_CORRUPTED_RETURN(lastfree == 0);
138 XFS_WANT_CORRUPTED_RETURN(
139 be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup)) ==
140 (char *)dup - (char *)hdr);
141 dfp = xfs_dir2_data_freefind(hdr, bf, dup);
142 if (dfp) {
143 i = (int)(dfp - bf);
144 XFS_WANT_CORRUPTED_RETURN(
145 (freeseen & (1 << i)) == 0);
146 freeseen |= 1 << i;
147 } else {
148 XFS_WANT_CORRUPTED_RETURN(
149 be16_to_cpu(dup->length) <=
150 be16_to_cpu(bf[2].length));
151 }
152 p += be16_to_cpu(dup->length);
153 lastfree = 1;
154 continue;
155 }
156
157
158
159
160
161
162 dep = (xfs_dir2_data_entry_t *)p;
163 XFS_WANT_CORRUPTED_RETURN(dep->namelen != 0);
164 XFS_WANT_CORRUPTED_RETURN(
165 !xfs_dir_ino_validate(mp, be64_to_cpu(dep->inumber)));
166 XFS_WANT_CORRUPTED_RETURN(
167 be16_to_cpu(*ops->data_entry_tag_p(dep)) ==
168 (char *)dep - (char *)hdr);
169 XFS_WANT_CORRUPTED_RETURN(
170 ops->data_get_ftype(dep) < XFS_DIR3_FT_MAX);
171 count++;
172 lastfree = 0;
173 if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
174 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) {
175 addr = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
176 (xfs_dir2_data_aoff_t)
177 ((char *)dep - (char *)hdr));
178 name.name = dep->name;
179 name.len = dep->namelen;
180 hash = mp->m_dirnameops->hashname(&name);
181 for (i = 0; i < be32_to_cpu(btp->count); i++) {
182 if (be32_to_cpu(lep[i].address) == addr &&
183 be32_to_cpu(lep[i].hashval) == hash)
184 break;
185 }
186 XFS_WANT_CORRUPTED_RETURN(i < be32_to_cpu(btp->count));
187 }
188 p += ops->data_entsize(dep->namelen);
189 }
190
191
192
193 XFS_WANT_CORRUPTED_RETURN(freeseen == 7);
194 if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
195 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) {
196 for (i = stale = 0; i < be32_to_cpu(btp->count); i++) {
197 if (lep[i].address ==
198 cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
199 stale++;
200 if (i > 0)
201 XFS_WANT_CORRUPTED_RETURN(
202 be32_to_cpu(lep[i].hashval) >=
203 be32_to_cpu(lep[i - 1].hashval));
204 }
205 XFS_WANT_CORRUPTED_RETURN(count ==
206 be32_to_cpu(btp->count) - be32_to_cpu(btp->stale));
207 XFS_WANT_CORRUPTED_RETURN(stale == be32_to_cpu(btp->stale));
208 }
209 return 0;
210}
211
212static bool
213xfs_dir3_data_verify(
214 struct xfs_buf *bp)
215{
216 struct xfs_mount *mp = bp->b_target->bt_mount;
217 struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
218
219 if (xfs_sb_version_hascrc(&mp->m_sb)) {
220 if (hdr3->magic != cpu_to_be32(XFS_DIR3_DATA_MAGIC))
221 return false;
222 if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_uuid))
223 return false;
224 if (be64_to_cpu(hdr3->blkno) != bp->b_bn)
225 return false;
226 } else {
227 if (hdr3->magic != cpu_to_be32(XFS_DIR2_DATA_MAGIC))
228 return false;
229 }
230 if (__xfs_dir3_data_check(NULL, bp))
231 return false;
232 return true;
233}
234
235
236
237
238
239
240static void
241xfs_dir3_data_reada_verify(
242 struct xfs_buf *bp)
243{
244 struct xfs_mount *mp = bp->b_target->bt_mount;
245 struct xfs_dir2_data_hdr *hdr = bp->b_addr;
246
247 switch (hdr->magic) {
248 case cpu_to_be32(XFS_DIR2_BLOCK_MAGIC):
249 case cpu_to_be32(XFS_DIR3_BLOCK_MAGIC):
250 bp->b_ops = &xfs_dir3_block_buf_ops;
251 bp->b_ops->verify_read(bp);
252 return;
253 case cpu_to_be32(XFS_DIR2_DATA_MAGIC):
254 case cpu_to_be32(XFS_DIR3_DATA_MAGIC):
255 xfs_dir3_data_verify(bp);
256 return;
257 default:
258 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, hdr);
259 xfs_buf_ioerror(bp, EFSCORRUPTED);
260 break;
261 }
262}
263
264static void
265xfs_dir3_data_read_verify(
266 struct xfs_buf *bp)
267{
268 struct xfs_mount *mp = bp->b_target->bt_mount;
269
270 if ((xfs_sb_version_hascrc(&mp->m_sb) &&
271 !xfs_verify_cksum(bp->b_addr, BBTOB(bp->b_length),
272 XFS_DIR3_DATA_CRC_OFF)) ||
273 !xfs_dir3_data_verify(bp)) {
274 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
275 xfs_buf_ioerror(bp, EFSCORRUPTED);
276 }
277}
278
279static void
280xfs_dir3_data_write_verify(
281 struct xfs_buf *bp)
282{
283 struct xfs_mount *mp = bp->b_target->bt_mount;
284 struct xfs_buf_log_item *bip = bp->b_fspriv;
285 struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
286
287 if (!xfs_dir3_data_verify(bp)) {
288 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, bp->b_addr);
289 xfs_buf_ioerror(bp, EFSCORRUPTED);
290 return;
291 }
292
293 if (!xfs_sb_version_hascrc(&mp->m_sb))
294 return;
295
296 if (bip)
297 hdr3->lsn = cpu_to_be64(bip->bli_item.li_lsn);
298
299 xfs_update_cksum(bp->b_addr, BBTOB(bp->b_length), XFS_DIR3_DATA_CRC_OFF);
300}
301
302const struct xfs_buf_ops xfs_dir3_data_buf_ops = {
303 .verify_read = xfs_dir3_data_read_verify,
304 .verify_write = xfs_dir3_data_write_verify,
305};
306
307static const struct xfs_buf_ops xfs_dir3_data_reada_buf_ops = {
308 .verify_read = xfs_dir3_data_reada_verify,
309 .verify_write = xfs_dir3_data_write_verify,
310};
311
312
313int
314xfs_dir3_data_read(
315 struct xfs_trans *tp,
316 struct xfs_inode *dp,
317 xfs_dablk_t bno,
318 xfs_daddr_t mapped_bno,
319 struct xfs_buf **bpp)
320{
321 int err;
322
323 err = xfs_da_read_buf(tp, dp, bno, mapped_bno, bpp,
324 XFS_DATA_FORK, &xfs_dir3_data_buf_ops);
325 if (!err && tp)
326 xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_DATA_BUF);
327 return err;
328}
329
330int
331xfs_dir3_data_readahead(
332 struct xfs_trans *tp,
333 struct xfs_inode *dp,
334 xfs_dablk_t bno,
335 xfs_daddr_t mapped_bno)
336{
337 return xfs_da_reada_buf(tp, dp, bno, mapped_bno,
338 XFS_DATA_FORK, &xfs_dir3_data_reada_buf_ops);
339}
340
341
342
343
344
345xfs_dir2_data_free_t *
346xfs_dir2_data_freefind(
347 struct xfs_dir2_data_hdr *hdr,
348 struct xfs_dir2_data_free *bf,
349 struct xfs_dir2_data_unused *dup)
350{
351 xfs_dir2_data_free_t *dfp;
352 xfs_dir2_data_aoff_t off;
353#ifdef DEBUG
354 int matched;
355 int seenzero;
356#endif
357
358 off = (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr);
359
360#ifdef DEBUG
361
362
363
364
365
366 ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
367 hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
368 hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
369 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
370 for (dfp = &bf[0], seenzero = matched = 0;
371 dfp < &bf[XFS_DIR2_DATA_FD_COUNT];
372 dfp++) {
373 if (!dfp->offset) {
374 ASSERT(!dfp->length);
375 seenzero = 1;
376 continue;
377 }
378 ASSERT(seenzero == 0);
379 if (be16_to_cpu(dfp->offset) == off) {
380 matched = 1;
381 ASSERT(dfp->length == dup->length);
382 } else if (off < be16_to_cpu(dfp->offset))
383 ASSERT(off + be16_to_cpu(dup->length) <= be16_to_cpu(dfp->offset));
384 else
385 ASSERT(be16_to_cpu(dfp->offset) + be16_to_cpu(dfp->length) <= off);
386 ASSERT(matched || be16_to_cpu(dfp->length) >= be16_to_cpu(dup->length));
387 if (dfp > &bf[0])
388 ASSERT(be16_to_cpu(dfp[-1].length) >= be16_to_cpu(dfp[0].length));
389 }
390#endif
391
392
393
394
395 if (be16_to_cpu(dup->length) <
396 be16_to_cpu(bf[XFS_DIR2_DATA_FD_COUNT - 1].length))
397 return NULL;
398
399
400
401 for (dfp = &bf[0]; dfp < &bf[XFS_DIR2_DATA_FD_COUNT]; dfp++) {
402 if (!dfp->offset)
403 return NULL;
404 if (be16_to_cpu(dfp->offset) == off)
405 return dfp;
406 }
407
408
409
410 return NULL;
411}
412
413
414
415
416xfs_dir2_data_free_t *
417xfs_dir2_data_freeinsert(
418 struct xfs_dir2_data_hdr *hdr,
419 struct xfs_dir2_data_free *dfp,
420 struct xfs_dir2_data_unused *dup,
421 int *loghead)
422{
423 xfs_dir2_data_free_t new;
424
425 ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
426 hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
427 hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
428 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
429
430 new.length = dup->length;
431 new.offset = cpu_to_be16((char *)dup - (char *)hdr);
432
433
434
435
436 if (be16_to_cpu(new.length) > be16_to_cpu(dfp[0].length)) {
437 dfp[2] = dfp[1];
438 dfp[1] = dfp[0];
439 dfp[0] = new;
440 *loghead = 1;
441 return &dfp[0];
442 }
443 if (be16_to_cpu(new.length) > be16_to_cpu(dfp[1].length)) {
444 dfp[2] = dfp[1];
445 dfp[1] = new;
446 *loghead = 1;
447 return &dfp[1];
448 }
449 if (be16_to_cpu(new.length) > be16_to_cpu(dfp[2].length)) {
450 dfp[2] = new;
451 *loghead = 1;
452 return &dfp[2];
453 }
454 return NULL;
455}
456
457
458
459
460STATIC void
461xfs_dir2_data_freeremove(
462 struct xfs_dir2_data_hdr *hdr,
463 struct xfs_dir2_data_free *bf,
464 struct xfs_dir2_data_free *dfp,
465 int *loghead)
466{
467
468 ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
469 hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
470 hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
471 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
472
473
474
475
476 if (dfp == &bf[0]) {
477 bf[0] = bf[1];
478 bf[1] = bf[2];
479 }
480
481
482
483 else if (dfp == &bf[1])
484 bf[1] = bf[2];
485
486
487
488 else
489 ASSERT(dfp == &bf[2]);
490
491
492
493 bf[2].length = 0;
494 bf[2].offset = 0;
495 *loghead = 1;
496}
497
498
499
500
501void
502xfs_dir2_data_freescan(
503 struct xfs_inode *dp,
504 struct xfs_dir2_data_hdr *hdr,
505 int *loghead)
506{
507 xfs_dir2_block_tail_t *btp;
508 xfs_dir2_data_entry_t *dep;
509 xfs_dir2_data_unused_t *dup;
510 struct xfs_dir2_data_free *bf;
511 char *endp;
512 char *p;
513
514 ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
515 hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
516 hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
517 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
518
519
520
521
522 bf = dp->d_ops->data_bestfree_p(hdr);
523 memset(bf, 0, sizeof(*bf) * XFS_DIR2_DATA_FD_COUNT);
524 *loghead = 1;
525
526
527
528 p = (char *)dp->d_ops->data_entry_p(hdr);
529 if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
530 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) {
531 btp = xfs_dir2_block_tail_p(dp->i_mount, hdr);
532 endp = (char *)xfs_dir2_block_leaf_p(btp);
533 } else
534 endp = (char *)hdr + dp->i_mount->m_dirblksize;
535
536
537
538 while (p < endp) {
539 dup = (xfs_dir2_data_unused_t *)p;
540
541
542
543 if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
544 ASSERT((char *)dup - (char *)hdr ==
545 be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup)));
546 xfs_dir2_data_freeinsert(hdr, bf, dup, loghead);
547 p += be16_to_cpu(dup->length);
548 }
549
550
551
552 else {
553 dep = (xfs_dir2_data_entry_t *)p;
554 ASSERT((char *)dep - (char *)hdr ==
555 be16_to_cpu(*dp->d_ops->data_entry_tag_p(dep)));
556 p += dp->d_ops->data_entsize(dep->namelen);
557 }
558 }
559}
560
561
562
563
564
565int
566xfs_dir3_data_init(
567 xfs_da_args_t *args,
568 xfs_dir2_db_t blkno,
569 struct xfs_buf **bpp)
570{
571 struct xfs_buf *bp;
572 xfs_dir2_data_hdr_t *hdr;
573 xfs_inode_t *dp;
574 xfs_dir2_data_unused_t *dup;
575 struct xfs_dir2_data_free *bf;
576 int error;
577 int i;
578 xfs_mount_t *mp;
579 xfs_trans_t *tp;
580 int t;
581
582 dp = args->dp;
583 mp = dp->i_mount;
584 tp = args->trans;
585
586
587
588 error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(mp, blkno), -1, &bp,
589 XFS_DATA_FORK);
590 if (error)
591 return error;
592 bp->b_ops = &xfs_dir3_data_buf_ops;
593 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_DATA_BUF);
594
595
596
597
598 hdr = bp->b_addr;
599 if (xfs_sb_version_hascrc(&mp->m_sb)) {
600 struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
601
602 memset(hdr3, 0, sizeof(*hdr3));
603 hdr3->magic = cpu_to_be32(XFS_DIR3_DATA_MAGIC);
604 hdr3->blkno = cpu_to_be64(bp->b_bn);
605 hdr3->owner = cpu_to_be64(dp->i_ino);
606 uuid_copy(&hdr3->uuid, &mp->m_sb.sb_uuid);
607
608 } else
609 hdr->magic = cpu_to_be32(XFS_DIR2_DATA_MAGIC);
610
611 bf = dp->d_ops->data_bestfree_p(hdr);
612 bf[0].offset = cpu_to_be16(dp->d_ops->data_entry_offset);
613 for (i = 1; i < XFS_DIR2_DATA_FD_COUNT; i++) {
614 bf[i].length = 0;
615 bf[i].offset = 0;
616 }
617
618
619
620
621 dup = dp->d_ops->data_unused_p(hdr);
622 dup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
623
624 t = mp->m_dirblksize - (uint)dp->d_ops->data_entry_offset;
625 bf[0].length = cpu_to_be16(t);
626 dup->length = cpu_to_be16(t);
627 *xfs_dir2_data_unused_tag_p(dup) = cpu_to_be16((char *)dup - (char *)hdr);
628
629
630
631 xfs_dir2_data_log_header(tp, dp, bp);
632 xfs_dir2_data_log_unused(tp, bp, dup);
633 *bpp = bp;
634 return 0;
635}
636
637
638
639
640void
641xfs_dir2_data_log_entry(
642 struct xfs_trans *tp,
643 struct xfs_inode *dp,
644 struct xfs_buf *bp,
645 xfs_dir2_data_entry_t *dep)
646{
647 struct xfs_dir2_data_hdr *hdr = bp->b_addr;
648
649 ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
650 hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
651 hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
652 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
653
654 xfs_trans_log_buf(tp, bp, (uint)((char *)dep - (char *)hdr),
655 (uint)((char *)(dp->d_ops->data_entry_tag_p(dep) + 1) -
656 (char *)hdr - 1));
657}
658
659
660
661
662void
663xfs_dir2_data_log_header(
664 struct xfs_trans *tp,
665 struct xfs_inode *dp,
666 struct xfs_buf *bp)
667{
668#ifdef DEBUG
669 struct xfs_dir2_data_hdr *hdr = bp->b_addr;
670
671 ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
672 hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
673 hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
674 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
675#endif
676
677 xfs_trans_log_buf(tp, bp, 0, dp->d_ops->data_entry_offset - 1);
678}
679
680
681
682
683void
684xfs_dir2_data_log_unused(
685 struct xfs_trans *tp,
686 struct xfs_buf *bp,
687 xfs_dir2_data_unused_t *dup)
688{
689 xfs_dir2_data_hdr_t *hdr = bp->b_addr;
690
691 ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
692 hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
693 hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
694 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
695
696
697
698
699 xfs_trans_log_buf(tp, bp, (uint)((char *)dup - (char *)hdr),
700 (uint)((char *)&dup->length + sizeof(dup->length) -
701 1 - (char *)hdr));
702
703
704
705 xfs_trans_log_buf(tp, bp,
706 (uint)((char *)xfs_dir2_data_unused_tag_p(dup) - (char *)hdr),
707 (uint)((char *)xfs_dir2_data_unused_tag_p(dup) - (char *)hdr +
708 sizeof(xfs_dir2_data_off_t) - 1));
709}
710
711
712
713
714
715void
716xfs_dir2_data_make_free(
717 struct xfs_trans *tp,
718 struct xfs_inode *dp,
719 struct xfs_buf *bp,
720 xfs_dir2_data_aoff_t offset,
721 xfs_dir2_data_aoff_t len,
722 int *needlogp,
723 int *needscanp)
724{
725 xfs_dir2_data_hdr_t *hdr;
726 xfs_dir2_data_free_t *dfp;
727 char *endptr;
728 xfs_mount_t *mp;
729 int needscan;
730 xfs_dir2_data_unused_t *newdup;
731 xfs_dir2_data_unused_t *postdup;
732 xfs_dir2_data_unused_t *prevdup;
733 struct xfs_dir2_data_free *bf;
734
735 mp = tp->t_mountp;
736 hdr = bp->b_addr;
737
738
739
740
741 if (hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
742 hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC))
743 endptr = (char *)hdr + mp->m_dirblksize;
744 else {
745 xfs_dir2_block_tail_t *btp;
746
747 ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
748 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
749 btp = xfs_dir2_block_tail_p(mp, hdr);
750 endptr = (char *)xfs_dir2_block_leaf_p(btp);
751 }
752
753
754
755
756 if (offset > dp->d_ops->data_entry_offset) {
757 __be16 *tagp;
758
759 tagp = (__be16 *)((char *)hdr + offset) - 1;
760 prevdup = (xfs_dir2_data_unused_t *)((char *)hdr + be16_to_cpu(*tagp));
761 if (be16_to_cpu(prevdup->freetag) != XFS_DIR2_DATA_FREE_TAG)
762 prevdup = NULL;
763 } else
764 prevdup = NULL;
765
766
767
768
769 if ((char *)hdr + offset + len < endptr) {
770 postdup =
771 (xfs_dir2_data_unused_t *)((char *)hdr + offset + len);
772 if (be16_to_cpu(postdup->freetag) != XFS_DIR2_DATA_FREE_TAG)
773 postdup = NULL;
774 } else
775 postdup = NULL;
776 ASSERT(*needscanp == 0);
777 needscan = 0;
778
779
780
781
782 bf = dp->d_ops->data_bestfree_p(hdr);
783 if (prevdup && postdup) {
784 xfs_dir2_data_free_t *dfp2;
785
786
787
788
789 dfp = xfs_dir2_data_freefind(hdr, bf, prevdup);
790 dfp2 = xfs_dir2_data_freefind(hdr, bf, postdup);
791
792
793
794
795
796
797 needscan = (bf[2].length != 0);
798
799
800
801 be16_add_cpu(&prevdup->length, len + be16_to_cpu(postdup->length));
802 *xfs_dir2_data_unused_tag_p(prevdup) =
803 cpu_to_be16((char *)prevdup - (char *)hdr);
804 xfs_dir2_data_log_unused(tp, bp, prevdup);
805 if (!needscan) {
806
807
808
809
810
811
812 ASSERT(dfp && dfp2);
813 if (dfp == &bf[1]) {
814 dfp = &bf[0];
815 ASSERT(dfp2 == dfp);
816 dfp2 = &bf[1];
817 }
818 xfs_dir2_data_freeremove(hdr, bf, dfp2, needlogp);
819 xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
820
821
822
823 dfp = xfs_dir2_data_freeinsert(hdr, bf, prevdup,
824 needlogp);
825 ASSERT(dfp == &bf[0]);
826 ASSERT(dfp->length == prevdup->length);
827 ASSERT(!dfp[1].length);
828 ASSERT(!dfp[2].length);
829 }
830 }
831
832
833
834 else if (prevdup) {
835 dfp = xfs_dir2_data_freefind(hdr, bf, prevdup);
836 be16_add_cpu(&prevdup->length, len);
837 *xfs_dir2_data_unused_tag_p(prevdup) =
838 cpu_to_be16((char *)prevdup - (char *)hdr);
839 xfs_dir2_data_log_unused(tp, bp, prevdup);
840
841
842
843
844
845 if (dfp) {
846 xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
847 xfs_dir2_data_freeinsert(hdr, bf, prevdup, needlogp);
848 }
849
850
851
852 else {
853 needscan = be16_to_cpu(prevdup->length) >
854 be16_to_cpu(bf[2].length);
855 }
856 }
857
858
859
860 else if (postdup) {
861 dfp = xfs_dir2_data_freefind(hdr, bf, postdup);
862 newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset);
863 newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
864 newdup->length = cpu_to_be16(len + be16_to_cpu(postdup->length));
865 *xfs_dir2_data_unused_tag_p(newdup) =
866 cpu_to_be16((char *)newdup - (char *)hdr);
867 xfs_dir2_data_log_unused(tp, bp, newdup);
868
869
870
871
872
873 if (dfp) {
874 xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
875 xfs_dir2_data_freeinsert(hdr, bf, newdup, needlogp);
876 }
877
878
879
880 else {
881 needscan = be16_to_cpu(newdup->length) >
882 be16_to_cpu(bf[2].length);
883 }
884 }
885
886
887
888 else {
889 newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset);
890 newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
891 newdup->length = cpu_to_be16(len);
892 *xfs_dir2_data_unused_tag_p(newdup) =
893 cpu_to_be16((char *)newdup - (char *)hdr);
894 xfs_dir2_data_log_unused(tp, bp, newdup);
895 xfs_dir2_data_freeinsert(hdr, bf, newdup, needlogp);
896 }
897 *needscanp = needscan;
898}
899
900
901
902
903void
904xfs_dir2_data_use_free(
905 struct xfs_trans *tp,
906 struct xfs_inode *dp,
907 struct xfs_buf *bp,
908 xfs_dir2_data_unused_t *dup,
909 xfs_dir2_data_aoff_t offset,
910 xfs_dir2_data_aoff_t len,
911 int *needlogp,
912 int *needscanp)
913{
914 xfs_dir2_data_hdr_t *hdr;
915 xfs_dir2_data_free_t *dfp;
916 int matchback;
917 int matchfront;
918 int needscan;
919 xfs_dir2_data_unused_t *newdup;
920 xfs_dir2_data_unused_t *newdup2;
921 int oldlen;
922 struct xfs_dir2_data_free *bf;
923
924 hdr = bp->b_addr;
925 ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
926 hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) ||
927 hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) ||
928 hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC));
929 ASSERT(be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG);
930 ASSERT(offset >= (char *)dup - (char *)hdr);
931 ASSERT(offset + len <= (char *)dup + be16_to_cpu(dup->length) - (char *)hdr);
932 ASSERT((char *)dup - (char *)hdr == be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup)));
933
934
935
936 oldlen = be16_to_cpu(dup->length);
937 bf = dp->d_ops->data_bestfree_p(hdr);
938 dfp = xfs_dir2_data_freefind(hdr, bf, dup);
939 ASSERT(dfp || oldlen <= be16_to_cpu(bf[2].length));
940
941
942
943 matchfront = (char *)dup - (char *)hdr == offset;
944 matchback = (char *)dup + oldlen - (char *)hdr == offset + len;
945 ASSERT(*needscanp == 0);
946 needscan = 0;
947
948
949
950
951 if (matchfront && matchback) {
952 if (dfp) {
953 needscan = (bf[2].offset != 0);
954 if (!needscan)
955 xfs_dir2_data_freeremove(hdr, bf, dfp,
956 needlogp);
957 }
958 }
959
960
961
962
963 else if (matchfront) {
964 newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset + len);
965 newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
966 newdup->length = cpu_to_be16(oldlen - len);
967 *xfs_dir2_data_unused_tag_p(newdup) =
968 cpu_to_be16((char *)newdup - (char *)hdr);
969 xfs_dir2_data_log_unused(tp, bp, newdup);
970
971
972
973 if (dfp) {
974 xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
975 dfp = xfs_dir2_data_freeinsert(hdr, bf, newdup,
976 needlogp);
977 ASSERT(dfp != NULL);
978 ASSERT(dfp->length == newdup->length);
979 ASSERT(be16_to_cpu(dfp->offset) == (char *)newdup - (char *)hdr);
980
981
982
983
984
985 needscan = dfp == &bf[2];
986 }
987 }
988
989
990
991
992 else if (matchback) {
993 newdup = dup;
994 newdup->length = cpu_to_be16(((char *)hdr + offset) - (char *)newdup);
995 *xfs_dir2_data_unused_tag_p(newdup) =
996 cpu_to_be16((char *)newdup - (char *)hdr);
997 xfs_dir2_data_log_unused(tp, bp, newdup);
998
999
1000
1001 if (dfp) {
1002 xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp);
1003 dfp = xfs_dir2_data_freeinsert(hdr, bf, newdup,
1004 needlogp);
1005 ASSERT(dfp != NULL);
1006 ASSERT(dfp->length == newdup->length);
1007 ASSERT(be16_to_cpu(dfp->offset) == (char *)newdup - (char *)hdr);
1008
1009
1010
1011
1012
1013 needscan = dfp == &bf[2];
1014 }
1015 }
1016
1017
1018
1019
1020 else {
1021 newdup = dup;
1022 newdup->length = cpu_to_be16(((char *)hdr + offset) - (char *)newdup);
1023 *xfs_dir2_data_unused_tag_p(newdup) =
1024 cpu_to_be16((char *)newdup - (char *)hdr);
1025 xfs_dir2_data_log_unused(tp, bp, newdup);
1026 newdup2 = (xfs_dir2_data_unused_t *)((char *)hdr + offset + len);
1027 newdup2->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
1028 newdup2->length = cpu_to_be16(oldlen - len - be16_to_cpu(newdup->length));
1029 *xfs_dir2_data_unused_tag_p(newdup2) =
1030 cpu_to_be16((char *)newdup2 - (char *)hdr);
1031 xfs_dir2_data_log_unused(tp, bp, newdup2);
1032
1033
1034
1035
1036
1037
1038
1039
1040 if (dfp) {
1041 needscan = (bf[2].length != 0);
1042 if (!needscan) {
1043 xfs_dir2_data_freeremove(hdr, bf, dfp,
1044 needlogp);
1045 xfs_dir2_data_freeinsert(hdr, bf, newdup,
1046 needlogp);
1047 xfs_dir2_data_freeinsert(hdr, bf, newdup2,
1048 needlogp);
1049 }
1050 }
1051 }
1052 *needscanp = needscan;
1053}
1054